Secession and treason were immoral, putting the traitors down was righteous.
And you don't decide how it should have been done.
You don't take disagreement well, do you?
I'm sure the British said the same thing about our forefathers when they declared their independence.
Looks like we know which side you would have taken. I don't suppose your last name is Arnold ?
You must really like slavery.
Not at all. Slavery was wrong, but it's a completely separate issue from whether secession was right or wrong.
The South wanted to continue the practice and they knew if they stayed in the union their days of being able to own other human beings were numbered. Their reason for secession was immoral, but regardless, they should have been allowed to leave the union and control their own destiny.
The north on the other hand did not go to war to end slavery. They fought to preserve the union. Slavery was a secondary issue. Lincoln himself even contemplated rounding up blacks and shipping them elsewhere, rather than fighting to free them. Many southerners believed that once the fighting started, most northerners would not stomach killing their southern white brothers in order to end slavery, and because of this the fighting would be short lived and they would prevail. Instead it's likely over 600,000 American men were killed, about 2% of the population, or in todays terms about 6 million.